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Test whether a list contains a specific value in Clojure
...se the keys here are indices and the vector in question does "contain" the index 0!).
To add to the confusion, in cases where it doesn't make sense to call contains?, it simply return false; this is what happens in (contains? :foo 1) and also (contains? '(100 101 102) 101). Update: In Clojure ≥ 1...
How can I read and parse CSV files in C++?
...class CSVRow
{
public:
std::string_view operator[](std::size_t index) const
{
return std::string_view(&m_line[m_data[index] + 1], m_data[index + 1] - (m_data[index] + 1));
}
std::size_t size() const
{
return m_data.size() - 1;
...
How to compare two files not in repo using git
...ff files where at least one of them is not in the repository by using --no-index:
git diff --no-index file1.txt file2.txt
It doesn't matter which one is tracked by git and which is not - one or both can be untracked, eg:
$ date > x
$ sleep 2
$ date > y
$ git diff --color-words --no-index x...
Extract a dplyr tbl column as a vector
...ad because you do not need to repeat the name of the column or specify the index.
iris2 %>% select(Species) %>% unlist(use.names = FALSE)
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Ruby - test for array
... The only issue with this is say I want to check if something is an indexed iterable, so arrays, linked lists, etc. would be cool, but I don't want key value stores like hashes?
– Colton Voege
Jan 8 '17 at 3:52
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jQuery SVG, why can't I addClass?
...elieve is the best approach:
// addClass
$('path').attr('class', function(index, classNames) {
return classNames + ' class-name';
});
// removeClass
$('path').attr('class', function(index, classNames) {
return classNames.replace('class-name', '');
});
...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
... of the simplest methods. However, you don't need a full lookup table.
//Index 1==0b0001 => 0b1000
//Index 7==0b0111 => 0b1110
//etc
static unsigned char lookup[16] = {
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
uint8_t reverse(uint8_t n) {
// Reve...
How do you take a git diff file, and apply it to a local branch that is a copy of the same repositor
...nks for the reply, but that caused an error saying, patch failed: filename.php:202 error:filename.php: patch does not apply. The good news is that its not the first filename in the file, so it at least would have been able to process some of the file. Any thoughts?
– Mike_K
...
Delete the first three rows of a dataframe in pandas
...to do this in a groupby()? This works but returns duplicate columns in the index df=pd.DataFrame({'v':np.arange(10).tolist()*2,'g':['a']*10+['b']*10});df.groupby('g').apply(lambda x: x.iloc[3:])
– citynorman
Aug 6 '17 at 22:24
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How can I generate random alphanumeric strings?
... you don't want that then why use RNGCSP in the first place?) Using mod to index into the chars array means that you'll get biased output unless chars.Length happens to be a divisor of 256.
– LukeH
Apr 3 '12 at 16:35
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